#region Licence
// Copyright (c) 2008 Tasman Logic Ltd

// Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
// and associated documentation files (the "Software"), to deal in the Software without restriction, 
// including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, 
// and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, 
// subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all copies 
// or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT 
// NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
// OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using ActiveSharp.PropertyMapping;
using NUnit.Framework;

namespace ActiveSharp.Tests
{
    [TestFixture]
    public class PropertyChangeNotificationTests
    {
        [Test]
        public void CanNotifyPropertyChanged()
        {
            TestClass t = new TestClass();
            string nameOfChangedProperty = null;
            t.PropertyChanged += delegate (object sender, PropertyChangedEventArgs args)
                                 {
                                     nameOfChangedProperty = args.PropertyName;
                                 };
            t.Foo = 5;
            Assert.AreEqual("Foo", nameOfChangedProperty);
            t.Bar = "Cat";
            Assert.AreEqual("Bar", nameOfChangedProperty);
        }

        [Test]
        public void DoNotNotifyIfSetToExistingValue()
        {
            TestClass t = new TestClass();
            t.Foo = 5;
            t.Bar = "Cat";

            string nameOfChangedProperty = null;
            t.PropertyChanged += delegate(object sender, PropertyChangedEventArgs args)
                                 {
                                     nameOfChangedProperty = args.PropertyName;
                                 };
            t.Foo = 5;
            Assert.IsNull(nameOfChangedProperty);
            t.Bar = "Cat";
            Assert.IsNull(nameOfChangedProperty);
        }


        public class TestClass: INotifyPropertyChanged
        {
            int _foo;
            string _bar;

            PropertyChangeHelper _propertyChangeHelper = new PropertyChangeHelper();

            public event PropertyChangedEventHandler PropertyChanged
            {
                add { _propertyChangeHelper.Add(value); }
                remove { _propertyChangeHelper.Remove(value); }
            }
            
            private void SetValue<T>(ref T field, T value)
            {
                _propertyChangeHelper.SetValue(this, ref field, value);
            }

            public int Foo
            {
                get { return _foo; }
                set { SetValue(ref _foo, value); }
            }

            public string Bar
            {
                get { return _bar; }
                set { SetValue(ref _bar, value); }
            }

        }
    }
}
